Tube writing pen for india ink



Sept 10, 1957 E. BUSCHLE TUBE WRITING PEN FOR INDIA INK Filed March 5, 1954 INVENTOR- QMP W agug ATTORNE/ TUBE WRITING PEN FOR INDIA INK Erich Buschle, Wuppertal-Elberfeld, Germany, assignor to Paul Buscllle, Wuppertal-Elberfeld, Germany Application March 5, 1954, Serial No. 414,370 Claims priority, application Germany March 6, 1953 6 Claims. (Cl. 120-44) The present invention relates to a tube writing pen for india ink with a cleaning device for the capillary fed small tube.

Tube writing pens are known in which the cleaning of the capillary tube is performed by a mechanical pushing device in connection with a reciprocating capillary wire or needle. These known structures which are designed for ink are equipped with a wire which extends through the writing tube, the inner end of the wire being conected with a weight which reciprocates in the pen upon subjecting the pen to a shaking motion. In this manner the color pigment which sets upon drying of the ink is pulverized and removed from the capillary tube, so the ink can flow therethrough from the ink containing housing of the pen.

By the use of such writing utensils for india ink, the Writing tube containing the capillary wire becomes so clogged due to strong tendency to crystallization of the india ink, that appreciably large forces are required for the cleaning of the capillary tube or a time consuming washing thereof is required.

The known pushing devices for cleaning the capillary tube have been found insufiicient to achieve the cleaning since the moving force obtainable from weights is not great enough to pulverize dried india ink.

It is, therefore, one object of the present invention to provide a tube writing pen which is equipped with a cleaning device operable by hand.

It is another object of the present invention to provide a tube writing pen with a capillary wire extending through the tube for cleaning the same, whereby hand operated means are provided for reciprocating the capillary wire in the tube.

The present structure constitutes an arrangement which permits the mechanical cleaning of the capillary tube before and during use of the pen in a simple manner, whereby the operating organ for the cleaning is disposed on the outside thereof. This structure permits also the separation of the ink containing chamber from the adjacent tapered operating chamber. This brings about the further advantage that the feed of the india ink to the capillary tube is independent from pressure changes in the inner chamber. Furthermore, the capillary tube may be changed during use of the pen, without danger that the india ink may run out.

It is also another object of the present invention to provide a resistant and operation-proof cleaning device for a tube writing pen, which device is adjusted to the necessary small dimensions, by providing a crank-shaft disposed crosswire in the pen body, one end of the capillary wire being connected to the crank-shaft and the pen body being equipped at its end with an end disk.

It is still another object of the present invention to provide a cleaning device for a tube writing pen, in which a wire is connected to a crosswise disposed crank-shaft in the pen body, whereby the crank-shaft is mounted in a separate tubular portion of the pen body, which portion has a closable opening for entrance of air.

nited States Patent It is a further object of the present invention to provide a tube writing pen which has a suction and pressure piston in the ink chamber, which piston is movable in axial direction by drill-like means.

With these and other objects in view, which will become apparent in the following detailed description, the present invention will be clearly understood in connection with the accompanying drawing, in which:

Figure 1 shows an axial section of the tube writing pen in accordance with the present invention; and

Fig. 2 is a fragmentary view of the setting means for the turning knob for the piston in the ink chamber.

Referring now to the drawing, the tube writing pen comprises a writing tube 1 which is removably secured to a threaded insert 2. The latter is threaded into the front portion 4 of the pen body, which front portion 4 is preferably tapered on its outside and secured to the intermediate tubular portion 9. The latter is screwed to the rear portion 11 constituting the ink containing chamber.

A crank-shaft 6 is crosswise disposed in the intermediate portion in such manner that one end of the crankshaft is mounted in the wall of the intermediate portion 9 While its other end extends to the outside of the body and is mounted in a stuffed bearing 8. This arrangement permits of easy assembly of the crank-shaft 6 in the pen body. The outer end of the crank-shaft 6 carries a knurled wheel 7 which is adapted as rotating means for the crank-shaft 6, to which one end of a connecting rod 5 is secured. One end of a guide rod 3 constituting an intermediate axially movable member is hooked to the other end of the connecting rod 5.

A capillary wire a is secured to the other end of the guide rod 3, which wire a is capable of reciprocating loosely in the capillary tube 1.

The intermediate portion has an opening 12, which may be closed by a screw b.

The bottom of the ink chamber 11 has an opening, in which a tube 10 preferably of synthetic material is inserted, which tube 10 feeds the india ink to the front portion 4. The tube 10 is inserted into the bottom of the ink chamber 11 in a tight manner.

The ink chamber 11 is further equipped with ink feeding means 13. A turning knob 15 is secured to the feeding means 13 adjacent therear end of the pen body and is equipped with a setting device 14 in order to permit dosage of the india ink to be injected.

The exchangeable insert 2 together with the writing tube 1 provide a continuous uninterrupted use of the pen, since this arrangement permits of exchange of a series of different inserts of difierent size. This change of the inserts may be performed without loss of any india ink due to the particular construction of the pen, since in the front portion 4 a small amount of india ink only, according to its use, is present. For this reason, the feeding of india ink through the tube it! in small quantities only is of importance. The india ink may be stored in the ink chamber 11 below its piston, without permitting that air causing the crystallization of the ink can enter. This is brought about by sealing off the ink chamber 11 by the piston 13 and by providing at its front end an outlet of small cross-section through the channel tube Itl. Normally, the second or lower chamber is under atmospheric pressure and this atmospheric pressure will clearly retain the ink in the ink chamber until such time as pressure higher than that of atmospheric pressure removes the ink from the ink chamber by operating the piston in the ink chamber. Furthermore, unless the screw b is removed in order to permit entrance of air into the second or lower chamber, the ink contained in the latter could not be removed and the pen would not write.

In order to fill the ink chamber 11 with india ink, the

3 chamber 11 is removed from the intermediate portion 9, so that only the tube 10 is used for filling the chamber 11 by a suction action through lifting the piston in the chamber 11. 1

During use of the pen, the screw 5 is removed and the opening lz permits the flow of air into the intermediate portion 9.

While I have described one embodiment of the pres ent invention, it is to be understood that this embodiment is given by example only and not in a limiting sense, the scope of the invention being determined by the objects and the claims.

I claim:

1. In a tubewriting pen, atubular body having a piston operatedink chamber, a tube secured to the front end of said body and defining a second chamber, a wire adapted to operate as cleaning riieans and extending through saidtube, a cross-shaft extending through said tube and having one end projecting outside the latter, means cooperating with said cross-shaft and connected with the rear end of said wire for a forced reciprocating movementof said Wire through said tube and means secured to the projecting end of said shaft for operating the latter.

2. The pen, as set forth in claim 1, in which said shaft is formed as a crank-shaft.

3. The pen, as set forth in claim 1, in which the operating means for the projecting end of said cross-shaft comprises a. knurled disk keyed to the end of said cross-shaft.

4. In a tube Writing pen, a tubular body having a piston operated ink chamber, a tube releasably secured to the front end of said body and defining a second chamber, said tube comprising an intermediate member and a front member releasably secured to said intermediate member, a wire adapted to operate as cleaning means-extending through said front member, a tube defining achannel of small cross-section connecting said ink chamber with said second chamber, a crank-shaft extending crosswise through said tube and means connecting the rear end of said wire with said crank-shaft for forced reciprocating movement of said wire through said front member, and

said intermediate member having a closable air opening, in order to provide atmospheric pressure in said second chamber.

5. In a tube writing pen, a tubular body having a piston operated ink chamber, a tube secured to the front end of said body and defininga second chamber, a wire adapted to operate as cleaning means and extending through said tube, a cross-shaft extending through said tube and having one end projecting outside the latter, means cooperating with said cross-shaft connected with the rear end of said wire for a forced reciprocating move ment of said wire through said tube and means secured to the projecting end of said shaft for operating the latter, said shaft being formed as a crank-shaft, and said connecting means comprising a connecting rod and an intermediate axially movable member, one end of said connecting rod being secured to said crank-shaft and the other end being connected to the rear end of said intermediate member, the front end of the latter being connected with the rear end of said wire.

6. In a tube writing pen, a tubular body having a piston operated ink chamber, a tube releasably secured to the front end of said body and defining a second chamber, said tube comprising an intermediate member and a front member releasably secured to said intermediate member, a wire adapted to operate as cleaning means extending through said front'member, a tube defining a channel of small cross-section connecting said ink chamber with said second chamber, a crank-shaft extending, crosswise through said tube and means connecting the rear end of said wire with said crank-shaft for forced reciprocating movement of said wire through said front member, and said intermediate member having a closable air opening' in order to provide atmospheric pressure in said second chamber, and a turning knob being disposed at the rear end of said tubular body and operatively connected with said piston rod for axial movement of said piston, the end face of said tubular body having a plurality of re cesses angularly spaced apart, and a spring biased means being disposed in said knob and projecting from the face I of said knob engaging the end face of said tubular body in order to assume different turning positions of said knob and, thereby, to provide filling dosages for the ink to said tube.

References Cited in the file of this patent UNITED STATES PATENTS 994,000 Hughes May 30, 1911 1,297,602 Siegienski Mar. 18, 1919 1,447,632 Schmidt Mar. 6, 1923 1,595,260 Swope Aug. 10, 1926 FOREIGN PATENTS 430,339 Italy Dec. 6, 1946 

